Glasbeek, M. and Sitters, R. and van Veldhoven, E. and von Zelewsky, A. and Humbs, W. and Yersin, Hartmut (1998) Optically detected magnetic resonance in the lowest triplet state of Pd(2-thpy)(2). INORGANIC CHEMISTRY, 37 (20). pp. 5159-5163. ISSN 0020-1669, 1520-510X
Full text not available from this repository.Abstract
An optically detected magnetic resonance (ODMR) study of the lowest excited state of Pd(2-thpy)(2) ((2-thpy)(-) = 2-thienylpyridinate) in an n-octane Shpol'skii matrix at T = 1.4 K is reported. The results in zero and low magnetic fields allow us to characterize the emissive triplet state in more detail. In this state the spin-orbit contributions to the zero-field splittings of the triplet substates are much more pronounced than for analogous Rh(III) chelate complexes. Microwave recovery experiments display the emission lifetimes of 134 mu s and 1200 mu s of two triplet substates, which are split by 2E = 2886 MHz (0.0962 cm(-1)). The D value characterizing the relative energy of the third sublevel is larger than 6600 MHz (0.22 cm(-1)) and is outside the microwave range of our experimental equipment. However, its decay time can be determined to be 235 mu s. Moreover, phosphorescence microwave double-resonance (PMDR) experiments reveal a spin selectivity in the vibrational satellite lines of the emission spectrum. Such a phenomenon is observed for the first time for transition-metal compounds. The selectivity is a consequence of different mechanisms of radiative vibronic deactivations from the different emissive triplet sublevels.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ORGANOMETALLIC DIIMINE COMPLEXES; VIBRATIONAL SATELLITE STRUCTURES; TRANSITION-METAL COMPLEXES; TIME-RESOLVED SPECTRA; ELECTRONIC STATES; EXCITED-STATES; ZEEMAN; SPECTROSCOPY; LOCALIZATION; RELAXATION |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Hartmut Yersin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Feb 2023 06:32 |
| Last Modified: | 23 Feb 2023 06:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49442 |
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